resetting signals to SIG_DFL

[William Ahern]

I want to fork+exec and setup a default environment, including closing all
descriptors and setting all signals to SIG_DFL. However, LinuxThreads
makes use of some real-time signals, so if I were to . . .

	for (sig = 0; sig < _NSIG; sig++)
		signal(sig,SIG_DFL);

. . . I'd clobber those signals. I could skip the signals between __SIGRTMIN
and SIGRTMIN. Will __SIGRTMIN always be available?

OTOH, even if I do clobber these signals, since I've already fork'd and am
about to execl and am only in a single thread, does it even matter? Won't
those signals be set pre-main after execl?

I'm trying to be reasonably portable. Are there other platforms
or issues where the idea of blindly resetting signals like this should
be thrown out?

Curious,

Bill